Jabberwalker Jabberwalker:
that would mean we're all psychotic by now.
.... compared to the other glacial mega-fauna that we have co-habited with (and wiped out)
ummm, yes. Yes we are.
There isn't a mega or macro or micro fauna that wouldn't wipe out it's food source if it could. There's no built in mechanism to prevent it, just environmental economics. We wiped them out, but it certainly didn't wipe us out, as other species would have been. And, did we really extirpate them, or did other environmental factors play a larger role.
You could say we're psychotic because of the conflict between our higher order thought processes and all our more unconscious, instinctual behavior that might conflict with them. But then that's nothing we're becoming, that's always been the case since we reached sapienhood.